fix(bundler/nsis): Include WebView2Loader.dll if found to match msi (#12324)

* fix(bundler/nsis): Include WebView2Loader.dll if found to match msi behavior

* Update fix-nsis-webviewloaderdll.md

* only include dll in gnu builds

Author: FabianLars

.changes/fix-nsis-webviewloaderdll.md

@@ -0,0 +1,5 @@
+---
+tauri-bundler: 'patch:bug'
+---
+
+Fixed an issue leading to NSIS based installers to not contain the `WebView2Loader.dll` file when targetting `windows-gnu`.

crates/tauri-bundler/src/bundle/windows/nsis/mod.rs

@@ -595,10 +595,24 @@ fn association_description(
 type ResourcesMap = BTreeMap<PathBuf, (PathBuf, PathBuf)>;
 fn generate_resource_data(settings: &Settings) -> crate::Result<ResourcesMap> {
   let mut resources = ResourcesMap::new();
+
   let cwd = std::env::current_dir()?;
 
   let mut added_resources = Vec::new();
 
+  // Adding WebViewer2Loader.dll in case windows-gnu toolchain is used
+  if settings.target().ends_with("-gnu") {
+    let loader_path =
+      dunce::simplified(&settings.project_out_directory().join("WebView2Loader.dll")).to_path_buf();
+    if loader_path.exists() {
+      added_resources.push(loader_path.clone());
+      resources.insert(
+        loader_path,
+        (PathBuf::new(), PathBuf::from("WebView2Loader.dll")),
+      );
+    }
+  }
+
   for resource in settings.resource_files().iter() {
     let resource = resource?;